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48 lines
1.8 KiB
48 lines
1.8 KiB
/*
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* Copyright © 2016 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef IGT_RAND_H
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#define IGT_RAND_H
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#include <stdint.h>
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uint32_t hars_petruska_f54_1_random(uint32_t *state);
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uint32_t hars_petruska_f54_1_random_seed(uint32_t seed);
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uint32_t hars_petruska_f54_1_random_unsafe(void);
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static inline void hars_petruska_f54_1_random_perturb(uint32_t xor)
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{
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uint32_t seed = hars_petruska_f54_1_random_seed(0) ^ xor;
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hars_petruska_f54_1_random_seed(seed);
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hars_petruska_f54_1_random_seed(hars_petruska_f54_1_random_unsafe());
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}
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/* Returns: pseudo-random number in interval [0, ep_ro) */
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static inline uint32_t hars_petruska_f54_1_random_unsafe_max(uint32_t ep_ro)
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{
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return ((uint64_t)hars_petruska_f54_1_random_unsafe() * ep_ro) >> 32;
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}
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#endif /* IGT_RAND_H */
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